This webpage is maintained by the Centers for Disease Control and Prevention (CDC). The webpage provides information and resources on Ammonia. "The majority of exposures occur by inhalation and typically lead to symptoms of ocular, nasal, and respiratory irritation. Signs and symptoms of poisoning might include eye redness and lacrimation, nose and throat irritation, cough, suffocation or choking sensation, and dyspnea (1-3)."
Centers for Disease Control and Prevention: http://www.cdc.gov/